Abstract
The River Sava is very polluted in certain sections. At times, the dissolved oxygen is completely exhausted (1.0 to 3.0 mg O2/l) resulting in frequent massive fish kills. The water quality has significantly deteriorated during the past few decades, due to the industry developed in the watershed and the increased population in the area. Especially heavy pollution loads come from the greater Zagreb area (153 t BOD5/day). Treating the wastewater from Zagreb could upgrade the water quality of the Sava, and 68 to 72% oxygen saturation could be achieved even under the most unfavourable conditions. Particular attention should be given to the choice of the treatment process, due to the planned construction of multi-purpose reservoirs along the Sava.
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